The Practice archive provides access to all Practice articles published in past issues of Communications of the ACM.
Hardware security is not assured.
Keeping users secure through their smartphones.
Create a Web Account
If you are an ACM member, Communications subscriber, Digital Library subscriber, or use your institution's subscription, please set up a web account to access premium content and site features. If you are a SIG member or member of the general public, you may set up a web account to comment on free articles and sign up for email alerts.